I don't depend on the trainer for all of my exercise in the winter. That would drive me nuts. I have a winter training program that I do 2-3X a week. It's usually 2 rides on the trainer and one outdoor ride, which I change to a x country ski or snow shoe. It's not that I never ride outdoors in the winter, but right now the roads are not in any way in the shape I would go out in.
Variety is the spice of life. The way I deal with winter is to get out in it, on my nordic skis or snow shoes.
March is coming soon enough.